Distinct in DataTable or DataView

How to remove duplicated data? Suppose I have a DataTable (dtMembers) looks like this:

ID	Name	City	ZipCode
01	Kenny	LA	12345
02	Peter	CA	54321
03	John	NY	13125
04	Jimmy	NY	13125

Using the following two lines of codes if you want to get the non-duplicated city list:

string[] columnNames = new string[] { "City" };
DataTable dtCity = dtMembers.DefaultView.ToTable(true, columnNames);

The result will be "LA, CA, NY".

Take a look of the DataView.ToTable() method and this discussion.